In case you need to re-calibrate the cube frequently, your cube may need a quick re-calibration of the gyro (IMU) sensor inside of it.
Here's how you do it:
1. Click the "Hamburger menu" (your profile image), and go to "Load Cube State".
2. Click "Advanced" (located in the top-right corner of the screen), and choose "Reset IMU".
3. Follow the instructions on the "Reset IMU" screen:
Place your cube on a flat surface, with the orange center facing up.
Make sure the cube is static (not moving), and click "Reset IMU".
*Note: it is normal (and expected) to have slow orientation drifts.